<template>
  <div>
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li v-for="(item,index) in goods" class="menu-item" :class="{'current':index===currentIndex}"
              @click="selectMenu(index)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>
            {{item.name}}
          </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodsWrapper">
        <ul>
          <li v-for="item in goods" class="food-list foodListHook">
            <h1 class="title">{{item.name}}</h1>
            <ul>
              <li v-for="food in item.foods" class="food-item border-1px" @click="selectFood(food)">
                <div class="icon">
                  <img :src="food.icon" alt="" width="57" height="57">
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                    <span>好评率{{food.rating}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <span v-show="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol :food="food" @drop="_drop"></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart ref="shopcart" :selectGoods="selectFoods" :deliveryPrice="seller.deliveryPrice"
                :minPrice="seller.minPrice"></shopcart>
    </div>
    <food :food="selectedFood" ref="food"></food>
  </div>
</template>

<script>
  import BScroll from 'better-scroll';
  import ShopCart from 'components/shopcart/ShopCart';
  import CartControl from 'components/cartcontrol/CartControl'
  import Food from 'components/food/Food'

  const ERR_OK = 0;
  export default {
    name: "goods",
    data() {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectedFood: {}
      }
    },
    props: {
      seller: Object
    },
    created() {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
      this.$http.get('/api/goods').then(res => {
        let response = res.body;
        if (response.errno === ERR_OK) {
          this.goods = response.data;
          this.$nextTick(() => {
            this.initScroll();
            this.calculateHeight();
          })
        }
      });
    },
    methods: {
      selectMenu(index) {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('foodListHook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 0);
      },
      initScroll() {
        this.enumScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });
        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          probeType: 3,
          click: true
        });

        this.foodsScroll.on('scroll', pos => {
          this.scrollY = Math.abs(Math.round(pos.y));
        });
      },
      calculateHeight() {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('foodListHook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          height += foodList[i].clientHeight;
          this.listHeight.push(height);
        }
      },
      _drop(el) {
        // 优化体验
        this.$nextTick(() => {
          this.$refs.shopcart.drop(el);
        });
      },
      selectFood(food) {
        this.selectedFood = food;
        this.$refs.food.show();
      }
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
            return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach(good => {
          good.foods.forEach(food => {
            if (food.count) {
              foods.push(food);
            }
          })
        });
        return foods;
      }
    },
    components: {
      shopcart: ShopCart,
      cartcontrol: CartControl,
      food: Food
    },
  }
</script>

<style type="text/less" lang="less" scoped>
  @import "../../common/less/mixin";

  .goods {
    display: flex;
    position: absolute;
    top: 174px;
    bottom: 46px;
    width: 100%;
    overflow: hidden;

    .menu-wrapper {
      width: 80px;
      flex: 0 0 80px;
      background: #f3f5f7;

      .menu-item {
        display: table;
        width: 56px;
        height: 54px;
        line-height: 14px;
        padding: 0 12px;

        &.current {
          position: relative;
          z-index: 10;
          margin-top: -1px;
          background-color: #fff;
          font-weight: 700;

          .text {
            border: none;
          }
        }

        .icon {
          display: inline-block;
          width: 12px;
          height: 12px;
          margin-right: 2px;
          background-size: 12px 12px;
          background-repeat: no-repeat;

          &.decrease {
            .bg2-image('decrease_3');
          }

          &.discount {
            .bg2-image('discount_3');
          }

          &.guarantee {
            .bg2-image('guarantee_3');
          }

          &.invoice {
            .bg2-image('invoice_3');
          }

          &.special {
            .bg2-image('special_3');
          }
        }

        .text {
          font-size: 12px;
          width: 56px;
          display: table-cell;
          vertical-align: middle;
          .border-1px(rgba(7, 17, 27, 1));
        }
      }
    }

    .foods-wrapper {
      flex: 1;

      .title {
        padding-left: 14px;
        height: 26px;
        line-height: 26px;
        border-left: 2px solid #d9dde1;
        font-size: 12px;
        color: rgb(147, 153, 159);
        background: #f3f5f7;
      }

      .food-item {
        display: flex;
        margin: 18px;
        padding-bottom: 18px;
        .border-1px(rgba(7, 17, 27, .1));

        &:last-of-type {
          .border-none();
          margin-bottom: 0;
        }

        .icon {
          flex: 0 0 57px;
          margin-right: 10px;
        }

        .content {
          flex: 1;

          .name {
            margin: 2px 0 8px;
            height: 14px;
            line-height: 14px;
            font-size: 14px;
            color: rgb(7, 17, 27);
          }

          .desc, .extra {
            line-height: 10px;
            font-size: 10px;
            color: rgb(147, 153, 159);
          }

          .desc {
            margin-bottom: 8px;
            line-height: 12px;
          }

          .extra {
            .count {
              margin-right: 12px;
            }
          }

          .price {
            font-weight: 700;
            line-height: 24px;

            .now {
              margin-right: 8px;
              font-size: 14px;
              color: rgb(240, 20, 20);
            }

            .old {
              text-decoration: line-through;
              font-size: 10px;
              color: rgb(147, 153, 159);
            }
          }

          .cartcontrol-wrapper {
            position: absolute;
            right: 0;
            bottom: 12px;
          }
        }
      }
    }
  }
</style>
